Mark my words. I don't know what, but something is in the works with this character.
She's one of a very small number of EU characters to gain massive appeal throughout fandom, joining the closely-knit ranks of Mara Jade, Corran Horn, and Grand Admiral Thrawn.
But that has very little to do with why I make the statement that big things are coming for her.
Rumors of her demise in Clone Wars: Episode 19 are greatly exaggerated. She's popped up many times since, chronologically speaking, in books and comics. A second supposed duel to the death with Anakin ensued months later on Coruscant, but there have been reports of her being sighted since. (Obi-Wan is currently investigating these reports in Obsession, which is billed as "The Must-Read Prelude to Revenge of the Sith," despite its not being all that closely linked to the movie.)
Over the next few months, it looks like we have another 3.75" Asajj figure to look forward to, as well as her being immortalized as the first EU figure to make it into the Unleashed line. There has to be a reason for both of those being produced rather than, say, a 3.75" Corran Horn or an Unleashed Mara Jade.
Perhaps more telling, an interview with a rep of Dark Horse comics in the Insider a while back specifically stated that, of the two original Clone Wars villains (Asajj Ventress and Durge), one would die prior to ROTS, and the other would survive the events of ROTS to play an unexpected role in the early years of the Empire.
Well, folks, Durge just died in Obsession. He was shot into a star by Anakin, who was having one of his occasional Dark Side moments.
Asajj has some major role yet to play. Books, comics, maybe television. I have no idea what, but she certainly bears watching.
Maybe the idealist buried deep within her will become disgusted when she discovers that the Clone Wars she's been involved in have been nothing but a ruse to cement the power of the most corrupt representative of the Republic, and she becomes one of the early Rebels?
Maybe she even turns out to be Mara's mother. . . ? No reason for the EU to abandon the "convenient coinkidink factor" the prequels have established.